Actual source code: grpath.c
1: #define PETSC_DESIRE_FEATURE_TEST_MACROS /* for realpath() */
2: #include <petscsys.h>
3: #if defined(PETSC_HAVE_PWD_H)
4: #include <pwd.h>
5: #endif
6: #include <ctype.h>
7: #include <sys/stat.h>
8: #if defined(PETSC_HAVE_UNISTD_H)
9: #include <unistd.h>
10: #endif
11: #if defined(PETSC_HAVE_SYS_UTSNAME_H)
12: #include <sys/utsname.h>
13: #endif
14: #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H)
15: #include <sys/systeminfo.h>
16: #endif
18: /*@C
19: PetscGetRealPath - Get the path without symbolic links etc. and in absolute form.
21: Not Collective
23: Input Parameter:
24: . path - path to resolve
26: Output Parameter:
27: . rpath - resolved path
29: Level: developer
31: Notes:
32: rpath is assumed to be of length PETSC_MAX_PATH_LEN.
34: Systems that use the automounter often generate absolute paths
35: of the form "/tmp_mnt....". However, the automounter will fail to
36: mount this path if it is not already mounted, so we remove this from
37: the head of the line. This may cause problems if, for some reason,
38: /tmp_mnt is valid and not the result of the automounter.
40: .seealso: PetscGetFullPath()
41: @*/
42: PetscErrorCode PetscGetRealPath(const char path[],char rpath[])
43: {
45: char tmp3[PETSC_MAX_PATH_LEN];
46: PetscBool flg;
47: #if !defined(PETSC_HAVE_REALPATH) && defined(PETSC_HAVE_READLINK)
48: char tmp1[PETSC_MAX_PATH_LEN],tmp4[PETSC_MAX_PATH_LEN],*tmp2;
49: size_t N,len,len1,len2;
50: int n,m;
51: #endif
54: #if defined(PETSC_HAVE_REALPATH)
55: if (!realpath(path,rpath)) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_LIB,"realpath()");
56: #elif defined(PETSC_HAVE_READLINK)
57: /* Algorithm: we move through the path, replacing links with the real paths. */
58: PetscStrcpy(rpath,path);
59: PetscStrlen(rpath,&N);
60: while (N) {
61: PetscStrncpy(tmp1,rpath,N);
62: tmp1[N] = 0;
63: n = readlink(tmp1,tmp3,PETSC_MAX_PATH_LEN);
64: if (n > 0) {
65: tmp3[n] = 0; /* readlink does not automatically add 0 to string end */
66: if (tmp3[0] != '/') {
67: PetscStrchr(tmp1,'/',&tmp2);
68: PetscStrlen(tmp1,&len1);
69: PetscStrlen(tmp2,&len2);
70: m = len1 - len2;
71: PetscStrncpy(tmp4,tmp1,m);
72: tmp4[m] = 0;
73: PetscStrlen(tmp4,&len);
74: PetscStrlcat(tmp4,"/",PETSC_MAX_PATH_LEN);
75: PetscStrlcat(tmp4,tmp3,PETSC_MAX_PATH_LEN);
76: PetscGetRealPath(tmp4,rpath);
77: PetscStrlcat(rpath,path+N,PETSC_MAX_PATH_LEN);
78: } else {
79: PetscGetRealPath(tmp3,tmp1);
80: PetscStrncpy(rpath,tmp1,PETSC_MAX_PATH_LEN);
81: PetscStrlcat(rpath,path+N,PETSC_MAX_PATH_LEN);
82: }
83: return(0);
84: }
85: PetscStrchr(tmp1,'/',&tmp2);
86: if (tmp2) {
87: PetscStrlen(tmp1,&len1);
88: PetscStrlen(tmp2,&len2);
89: N = len1 - len2;
90: } else {
91: PetscStrlen(tmp1,&N);
92: }
93: }
94: PetscStrncpy(rpath,path,PETSC_MAX_PATH_LEN);
95: #else /* Just punt */
96: PetscStrcpy(rpath,path);
97: #endif
99: /* remove garbage some automounters put at the beginning of the path */
100: PetscStrncmp("/tmp_mnt/",rpath,9,&flg);
101: if (flg) {
102: PetscStrcpy(tmp3,rpath + 8);
103: PetscStrcpy(rpath,tmp3);
104: }
105: return(0);
106: }